What is the test for criminal negligence in the context of battery on a peace officer?

Penal Code section 243, subdivision (b) prohibits battery on a peace officer. It applies "[w]hen a battery is committed against the person of a peace officer [...] and the person committing the offense knows or reasonably should know that the victim is a peace officer [ ] in the performance of his or her duties[.]" The statute does not impose strict liability for battery on a peace officer; rather, it punishes only someone who actually knows or reasonably should know the victim is an officer performing his or her duty. "Knows or reasonably should know" is a criminal negligence standard. It allows the wrongful intent required for a criminal offense to be proven either by the perpetrator's own state of mind or based on what a reasonable person would be aware of in a given situation. (See Williams v. Garcetti (1993) 5 Cal.4th 561, 574, 20 Cal.Rptr.2d 341, 853 P.2d 507 ["Under the criminal negligence standard, knowledge of the risk is determined by an objective test: [I]f a reasonable person in defendant's position would have been aware of the risk involved, then defendant is presumed to have had such an awareness. "].)